Mifflin County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Mifflin County: 0.
2. Weak tornadoes were under-recorded before Doppler radar coverage became national in the early 1990s, so earlier decades read low. Ratings use the Fujita scale before February 2007 and the Enhanced Fujita scale after.

Storm Prediction Center severe weather database, 1950 to 2025.

Every storm within 100 miles

1. Tropical storms and hurricanes (34 kt or more, still tropical) at closest approach. Post-tropical remnants with gale-force winds are listed but not counted. Direct: track within 50 miles; near: within 100 miles. Distance is measured to the county boundary for counties and to the city centre for cities, using positions interpolated hourly between HURDAT2 fixes.

National Hurricane Center HURDAT2, 1851 to 2025.

Smoke overhead

1. A smoke day is a date on which a smoke plume traced by NOAA Hazard Mapping System analysts from satellite imagery covered this place's point (the county's population centre or the city centre). Counts here are of medium or heavy smoke. Since 2018 analysts have often drawn light smoke as one area over most of the continent, so light-smoke counts are not comparable from year to year. The plumes show smoke anywhere in the air above, not air quality at the ground, and smoke hidden by cloud is missed.

NOAA Hazard Mapping System smoke analysis, 2011 to 2026, retrieved October 30, 2026.

Claims by ZIP code

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026. NOAA Storm Events through 2026.

River crests

River gauges

1. Crests are the highest and the recent crests the National Weather Service lists for each river gauge in the county that has a flood stage, not every flood. Flood categories use each gauge's current flood stages; crests from before levees, dams or channel changes may not be comparable. Crests measured on an old datum are left out of the rankings.

NOAA National Water Prediction Service gauge records, retrieved October 30, 2026.

1. The Palmer Drought Severity Index is computed by NOAA each month from the county's average temperature and precipitation, relative to the county's own climate. Zero is normal; -3 or lower is severe drought and -4 or lower extreme drought. It describes the long-term balance of moisture, not water supply or crop losses.

NOAA NCEI nClimDiv county Palmer Drought Severity Index, 1895 to September 2026, issued October 6, 2026.

1. Earthquakes of magnitude 2.5 or more in the USGS Comprehensive Catalog since 1900. Within 50 miles means the epicentre lies within 50 miles of the county boundary (or inside the county).
2. Small earthquakes were under-recorded before the modern seismic networks of the 1970s and are still missed in remote areas, so early decades read low. Magnitudes are as the catalogue reports them and mix scales (moment, local and body-wave).

USGS ANSS Comprehensive Earthquake Catalog, 1900 to present, retrieved October 30, 2026.

Costliest events since 1996

1. Apr 19, 2019Tornado$500,000
   National Weather Service narrative

   A National Weather Service in State College PA has confirmed an EF2 tornado near Lewistown in Mifflin County Pennsylvania on April 19, 2019.||The tornado first touched down near the reservoir off of Minehart Road, south of Route 103 in Granville. Several hundred trees were felled and snapped in a path around a mile long extending to the north. This was where the most intense damage occurred, where winds were estimated at 115 mph. ||The tornado then jogged to a more northeasterly direction, moving through Riverside Campground. Several dozen large trees were snapped and uprooted. About 5 trailers were totally destroyed by falling trees, with about a dozen others sustaining damage.…

2. Sep 7, 2011Flood$100,000
   National Weather Service narrative

   Heavy rainfall from the remnants of Tropical Storm Lee caused extensive flooding across Mifflin County. Damage to roads and bridges across Mifflin County was estimated at nearly $100,000.

3. Nov 8, 1996Tornado$40,000
   National Weather Service narrative

   An F1 tornado touched down in Burnham about 1/2 mile east of new route 322 in the Weis Mall parking lot. The tornado demolished the roof of a carwash and partially damaged the roof of the YMCA. Trees were also damaged along the ridge about 1 mile east of the initial touchdown. Several eyewitnesses reported seeing a dark swirling cloud, saw flying debris and reported a loud noise. There were no deaths or injuries.

4. Apr 9, 2001Thunderstorm Wind$25,000
5. Apr 3, 2016High Wind, Mifflin$25,000
   National Weather Service narrative

   Non-thunderstorm wind gusts estimated around 60 mph collapsed a trailer near Lewistown with a family inside. There were two injuries.

6. Apr 8, 2010Thunderstorm Wind$15,000
   National Weather Service narrative

   Thunderstorm winds estimated near 80 mph uplifted a large (26x40) garage roof and carried it approximately 200 feet from the original structure. The damage occurred in the area of 169 Queen Street in Reedsville (Brown Township). Additional debris was lifted nearly 75 feet over surrounding obstructions. Several homes in the immediate area were affected by downed wires. The damage was confined to the garage roof with only minor residual damage noted. No injuries were reported.

7. Apr 9, 2000High Wind, Mifflin$15,000
   National Weather Service narrative

   Cold air and strong northerly winds followed the snow as low pressure moved northeast out of the state. Trees were down in a few locations. Shingles blew off the roof of a home in the Port Royal area. Emergency Management in Gettysburg measured wind gusts to 58mph around 12:45 p.m.

8. Dec 12, 2000High Wind, Mifflin$14,000
9. Jul 9, 2023Thunderstorm Wind$12,000
   National Weather Service narrative

   A severe thunderstorm producing winds estimated near 60 mph knocked down approximately 15 large trees across railroad tracks to the east of Lewistown, causing the delay of an Amtrak passenger train for an hour while the trees were removed.

10. Mar 31, 2022Thunderstorm Wind$12,000
    National Weather Service narrative

    A severe thunderstorm producing winds estimated near 60 mph produced several reports of trees and wires down across Lewistown, including on the exit ramp from U.S. Route 322.

1. Storm Events records before 1996 cover only tornadoes, thunderstorm wind and hail. Damage figures are as reported by the National Weather Service at the time, not adjusted for inflation.

NOAA NCEI Storm Events Database, 1950 to 2026, issued October 26, 2026.

All-time high

106°FJul 23, 2011

All-time low

−17°FJan 20, 1994

Warmest night

80°FJul 29, 1941

Coldest day

1°FJan 19, 1994

Wettest day

5.40 inSep 18, 2004

Snowiest day

20.0 in2 times, most recently Mar 13, 1993

Hottest year

2012mean 54.2°F

Coldest year

1981mean 47.0°F

Wettest year

201861.63 in

Driest year

198025.77 in

Snowiest season

81.2 in1993-94

Station Lewistown (USC00364992), 460 ft elevation, 2.7 miles from the population centre. Daily records from 1938 to October 22, 2026; 99.1% of days in the last 30 years are complete. Records at a single station can differ from a city’s official threaded record, which may combine several stations.

NOAA NCEI Global Historical Climatology Network Daily.

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA Disaster Declarations Summaries, retrieved October 30, 2026. Statewide declarations are not listed.

Neighbouring counties

• Tornadoes NOAA Storm Prediction Center severe weather database, through 2025.
• Tropical cyclones NOAA National Hurricane Center HURDAT2 (Atlantic; Northeast and Central Pacific), through 2025.
• Wildfire USGS/USFS Monitoring Trends in Burn Severity, through 2026.
• Storm events NOAA NCEI Storm Events Database, through 2026.
• Flood insurance OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026.
• Declarations OpenFEMA Disaster Declarations Summaries v2, retrieved October 30, 2026.
• Weather records NOAA NCEI Global Historical Climatology Network Daily, station USC00364992.
• River crests NOAA National Weather Service, National Water Prediction Service river gauges, retrieved October 30, 2026.
• Drought NOAA NCEI nClimDiv county Palmer Drought Severity Index, through September 2026.
• Smoke NOAA NESDIS Hazard Mapping System smoke analysis, retrieved October 30, 2026.
• Earthquakes USGS ANSS Comprehensive Earthquake Catalog (ComCat), retrieved October 30, 2026.

Joins, thresholds and known limits are set out in the methodology. Found an error? Report it. Page built October 30, 2026.